Arc-light electrode.



and

-a result electrodes containing UNI ED STATES PATENT OFFICE.

BERTHOLD uoruscn, or BERLIN, GERMANY, asslcnoa TO GENERAL ELECTRIC comm,

A CORPORATION OF NEW YORK.'

ans-menu? ELECTRODE.

Specification of Letters Patent.

named Dec. 1, 1008.

Application fled my 16, 1906; Serial no: 317,168.

To all whom it meg concern: i Be it known that I, BERTHOLD Mosason, asubject of the King and useful Improvements in Arc-Light Electrodes, ofwhich the following is a specification.

My present invention relates to are light electrodescomposedprincipallyor in part ofunds, such as etite, titanium oxid,titanium carbid,

an the like; Such compounds form highly desirable constituents for arelight electrodes, for electrodes used as the negative electrodes ofdirect current are lamps, as suitably formed electrodes consuchcompounds in suitable amounts 'yield hly efiicient flaming or luminousarcs. T e inaterials spec ified" above are characterized, however, bythe fact that they become fluid at a temperature appreciably lower. thanthat at which they vaporize. As

have formed'on their arcing erids pools of melted material. Such a poolmay be obj ectionable especially when such an electrode is employed as anegative where the pool is large the are extending from it "gnay beveryunstable,the end the are; continually wande about on the surface of the,pool, thus p ucing an undesirable flickerin I have'discovered that. byadding si icon carbid referably in a finely powdered state,

to an e ectrode containing one or more ofthe metallic compoundsspecified, this flickering reduced .or entirely done may be tly v grroduce the best results the away with. To silicon .carbid' mingled withthe metallic compound or comof Prussia, residing at Berlin, Germany,have invented certain new city 'work or bridge, soto speak, of

a quietly burning,

them tend to ould be thoroughly compounds throughout the electrode whicheformed in the usual manner; I attribute the results arising from theuse of silicon carbid in this manner, to the great heat capaof thesilicon carbid wherebyxwithout fusin itself it takes up heat from themelted meta compounds. 'lhe presence of silicon carbid insures thatthearcing end of such an electrode is 'at all. times covered bye-netunfusedsilicon carbid, which results in are. .The siliconcarbid contentof such an electrode may vary between quite wide limits depending on thecircumstances of the I have obtained eircellent results electrodescontaining irom 5 to 90 per cent.

' of silicon carbid, though ordinarily I prefer to keep the siliconcarbid content materiall below the higher limit mentioned.-

What I claim'as new. and desire to secure by Letters Patent of theUnited States, is,

1. An are H ht electrode composed of one or more'meta ic compounds with5 to 90 percent. of silicon carbld. V

2. An arclight electrode composed of one or more metallic compoundsmixed with several per cent. of silicon carbid. V p

3'.- An are light electrode composed of one:

"or more metallic compounds intimately mixed with several percent. deredsilicon carbid..

of finely pow- In witness whereof, I have hereunto set hand this 24thday of April, 19Q6. BERTHOLD MONASCH; 'Witnesses: i

JULIUS. RUMLAND, v OSKA'R SINGER.

